Document Detail

Subcellular distribution and chemical form of Cd and Cd-Zn interaction in different barley genotypes.
MedLine Citation:
PMID:  16054913     Owner:  NLM     Status:  MEDLINE    
A hydroponic experiment was carried out to study the genotypic difference in subcellular distribution and chemical form of Cd and Zn uptake and their interaction in four barley genotypes. Increased Cd level in the medium caused a significant increase of Cd concentration in all fractions of roots/shoots, with most accumulation in FI (cell wall) and FIV (soluble). In root, the greatest amount of Cd was found in extraction solution of 2% HAC or 0.6M HCl, followed by 1M NaCl (20%), and lowest in extraction of 80% ethanol or d-H2O. While in shoot, the highest value of Cd accumulation was recorded in the fractions extracted by 1M NaCl and 2% HAC, followed by 0.6M HCl or d-H2O, and least in 80% ethanol extraction solution. There was a distinct difference among genotypes in Cd concentration in subcellular and chemical forms and it was found that the Cd-sensitive genotype Wumaoliuling, in comparison with the other three Cd-resistant genotypes, had higher Cd concentration in chloroplast-shoot/trophoplast-root (FII), membrane and organelle (FIII) and in inorganic and water-soluble Cd of roots, while lower in FI, FIV and pectates/protein integrated Cd. After 48 h of Cd treatment, the plants were replaced into Cd-free nutrient solution and grown for 72 h, a significant decrease in Cd concentration of root FI was observed, with less Cd reduction in Wumaoliuling. In comparison with control (no Cd), addition of Cd significantly increased Zn accumulation in chloroplast (FII), with least increase in Wumaoliuling. The Zn content in the other 3 fractions decreased significantly with addition of Cd, especially in roots, while Wumaoliuling was the most severely affected genotype. Moreover, it could be suggested Zn supplement could significantly reduce Cd concentration in root trophoplast and in shoot soluble fraction of Cd-treated plants.
Fei-Bo Wu; Jing Dong; Qiong Qiu Qian; Guo-Ping Zhang
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Chemosphere     Volume:  60     ISSN:  0045-6535     ISO Abbreviation:  Chemosphere     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-08-01     Completed Date:  2005-11-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  1437-46     Citation Subset:  IM    
Department of Agronomy, College of Agriculture and Biotechnology, Huajiachi Campus, Zhejiang University, Hangzhou 310029, PR China.
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MeSH Terms
Cadmium / analysis,  chemistry,  metabolism*
Hordeum / genetics*,  metabolism*
Plant Roots / chemistry,  metabolism
Plant Shoots / chemistry,  metabolism
Zinc / analysis,  chemistry,  metabolism*
Reg. No./Substance:
7440-43-9/Cadmium; 7440-66-6/Zinc

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